IL6 and neoplasm: Notably, the high prevalence of tumors located in the thymi of IL6-/-;Eμ-myc mice [Fig 1B] was also reflected in a higher number of B cells in the thymi of pre-tumor IL6-/-;Eμ-myc mice compared to IL6+/+;Eμ-myc young mice [Figs 2C left, S2A and S2D].